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Analog Devices Inc./Maxim Integrated MAX6381XR31D3+T
- Part No.:
- MAX6381XR31D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR31D3+T.pdf
- Description:
- IC MPU/RESET CIRC 3.08V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,905
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Product details
Overview
MAX6381XR31D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit in 3-pin SC70 package, featuring factory-set 3.08V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and active-low push-pull reset output. It monitors single supply voltage down to +1.8V while consuming only 3μA at 1.8V, and guarantees valid reset state down to VCC = 1V - ideal for battery-powered embedded controllers requiring reliable power-on reset.
For engineers reviewing the MAX6381XR31D3+T datasheet, MAX6381XR31D3+T pinout, MAX6381XR31D3+T application, or MAX6381XR31D3+T equivalent, key selection criteria include reset threshold accuracy across temperature, guaranteed operation at low VCC, minimal quiescent current, and compatibility with legacy MAX809/MAX6326 families in space-constrained designs.
Technical Context
The MAX6381XR31D3+T implements a precision bandgap-based reset comparator with ±2.5% threshold tolerance over full industrial temperature range (-40°C to +125°C) and 60ppm/°C tempco. Its internal timer generates a fixed 140ms minimum reset assertion period after VCC rises above 3.08V, independent of supply ramp rate.
This variant belongs to the MAX6381 series with no manual reset (MR) input or auxiliary RESET IN pin - it is a dedicated single-supply monitor with push-pull active-low output, ensuring immediate logic-level compatibility with standard μP reset inputs without external pullup components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal, ±2.5% over -40°C to +125°C - ensures deterministic reset release across automotive/industrial environments |
| Reset Timeout | 140ms minimum - holds μP in reset long enough for stable clock and supply settling before code execution |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Operating Voltage | +1.0V to +5.5V - supports valid reset assertion even during deep brownout down to 1V |
| Output Type | Active-low push-pull - drives reset line directly without external pullup, compatible with TTL/CMOS μP inputs |
| Package | 3-pin SC70 (X3+2 outline) - 1.25mm × 0.85mm footprint for ultra-compact PCB layouts |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive and industrial control applications |
Pinout & Package
MAX6381XR31D3+T uses a 3-pin SC70 package (outline 21-0075, land pattern 90-0208) with exposed pad not connected internally. Pin 1 is RESET (active-low push-pull output), Pin 2 is VCC (supply input), and Pin 3 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull output - asserts low during VCC undervoltage or brownout; deasserts high after timeout |
| 2 | VCC | Main supply input and monitored voltage rail - powers device and serves as primary reset trigger source |
| 3 | GND | Analog/digital ground reference - must be low-impedance connection to ensure accurate threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.08V with ±2.5% tolerance over full temperature range - eliminates need for external resistor dividers or calibration |
| Ultra-low supply current | 3μA at 1.8V - extends battery life in portable medical and sensor nodes without sacrificing reset reliability |
| Valid reset down to VCC = 1V | Guaranteed logic-level output even during severe brownout - prevents spurious μP wake-up before supply stabilization |
| Negative-going transient immunity | Rejects sub-10µs VCC glitches up to 100mV below threshold - improves robustness in electrically noisy environments |
| Pb-free RoHS-compliant packaging | +T suffix indicates lead-free SC70 - meets IPC/JEDEC reflow standards (260°C peak) and environmental compliance requirements |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Power sequencing and fault recovery in programmable logic controllers operating in factory-floor environments with wide ambient temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Primary VCC supervisor ensuring clean μP reset during AC line sags, hot-swap events, or backup battery switchover. Use Value: 3.08V threshold matches common 3.3V I/O rail; 140ms timeout exceeds typical FPGA configuration time; ±2.5% accuracy prevents false resets at temperature extremes. | Use Scenario: Reset management for microcontrollers in door module ECUs exposed to automotive battery transients and thermal cycling. IC Role / Device Role / Timing Role: Single-rail power monitor for 3.3V domain, providing fail-safe initialization after cold crank or load dump recovery. Use Value: -40°C to +125°C rating ensures operation across full AEC-Q100 Grade 2 range; 3μA current minimizes parasitic drain on standby battery. |
| Portable Medical Sensor Node | Smart Energy Meter MCU |
Use Scenario: Long-life battery-powered glucose monitor requiring guaranteed boot integrity after storage or low-battery wake-up. IC Role / Device Role / Timing Role: Low-voltage supervisor enabling safe firmware execution only when regulated 1.8V rail is stable. Use Value: Valid reset assertion down to VCC = 1V prevents erratic behavior during shallow discharge; SC70 footprint saves board area in compact wearable form factor. | Use Scenario: Reset coordination for dual-core metering SoC during grid voltage dips and zero-crossing interruptions. IC Role / Device Role / Timing Role: Primary reset generator for main application processor, synchronized to 3.3V supply stability. Use Value: 140ms timeout exceeds maximum allowable delay for metrology ADC calibration sequence; push-pull output eliminates pullup resistor, reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | Same 3.08V threshold and 140ms timeout, but ±3% accuracy over -40°C to +85°C only; higher 10μA ICC at 1.8V | Limited to commercial temperature range; less suitable for under-hood or industrial deployments | Select when cost sensitivity outweighs extended temperature performance and ultra-low power needs |
| TPS3808G30DBVR | 3.0V threshold (±0.5%), 200ms timeout, 1.6μA ICC at 1.8V; SOT-23-3 package | Higher accuracy and lower current, but requires external capacitor for timeout setting; no factory-trimmed timing | Prefer when tighter threshold tolerance is critical and design can accommodate timing component placement |
Compared with MAX809TRD3+T, MAX6381XR31D3+T delivers superior temperature stability and 3× lower supply current; versus TPS3808G30DBVR, it trades minor threshold accuracy for guaranteed fixed timing and zero external components - simplifying layout and qualification in high-volume consumer and industrial designs.
Availability
MAX6381XR31D3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical sensor nodes, smart energy meter MCUs, and battery-powered instrumentation requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6381XR31D3+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated, now part of Analog Devices, designs precision analog and mixed-signal ICs for industrial, automotive, communications, and computing markets - emphasizing reliability, low power, and small-footprint integration.
The MAX6381–MAX6390 family targets space- and power-constrained embedded systems needing highly accurate, low-current reset supervision with factory-trimmed thresholds and fixed timeouts - eliminating external timing components and calibration effort.
FAQ
What is the exact reset threshold voltage of MAX6381XR31D3+T and how does it vary with temperature?
The MAX6381XR31D3+T has a nominal reset threshold of 3.08V, with guaranteed tolerance of ±2.5% over the full operating temperature range of -40°C to +125°C. This corresponds to a minimum threshold of 3.00V and maximum of 3.15V at any temperature within that range. The device exhibits a tempco of 60ppm/°C, meaning threshold drift is tightly controlled and predictable across thermal stress conditions.
Does MAX6381XR31D3+T include a manual reset input (MR) or auxiliary RESET IN pin?
No, MAX6381XR31D3+T does not include a manual reset input or auxiliary RESET IN pin. It is a basic single-supply supervisory circuit with only three pins: RESET (active-low push-pull), VCC, and GND. Manual reset capability is present only in MAX6384–MAX6386 and MAX6390 variants, while RESET IN functionality is exclusive to MAX6387–MAX6389 devices.
What is the minimum supply voltage at which MAX6381XR31D3+T guarantees correct reset output logic levels?
MAX6381XR31D3+T guarantees valid reset output logic states down to VCC = 1.0V. When VCC drops below the 3.08V threshold, the active-low push-pull RESET output is driven solidly low. After VCC recovers above threshold, RESET remains low for the full 140ms timeout and then transitions high - all while maintaining specified VOL and VOH performance, even at VCC = 1.0V.
Is MAX6381XR31D3+T pin-compatible with older Maxim reset supervisors like MAX809?
Yes, MAX6381XR31D3+T is pin-compatible with MAX809TRD3+T and other members of the MAX809/MAX810 family in the 3-pin SC70 package. Both share identical pinout (RESET, VCC, GND), same footprint, and compatible voltage and timing specifications - enabling drop-in replacement in existing designs without PCB modification.
What package type and RoHS status does MAX6381XR31D3+T use?
MAX6381XR31D3+T uses a 3-pin SC70 package (outline number 21-0075, land pattern 90-0208) with dimensions 1.25mm × 0.85mm. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant, qualified for standard JEDEC reflow profiles with peak temperature up to +260°C.
MAX6381XR31D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR31D3+T FAQ
1.How can I place an order for MAX6381XR31D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR31D3+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6381XR31D3+T reliable?
The price and inventory of MAX6381XR31D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR31D3+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR31D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR31D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR31D3+T?
MAX6381XR31D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR31D3+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6381XR31D3+T?
For technical support, including MAX6381XR31D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR31D3+T requirements.
6.How does Aetrix verify that MAX6381XR31D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR31D3+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6381XR31D3+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR31D3+T?
All MAX6381XR31D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR31D3+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6381XR31D3+T part is unused and in its original packaging.
Return procedure for MAX6381XR31D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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